Det Insp Ian Thornes of Huddersfield CID said: “The man was approached by a white and a mixed race male as he was walking along Elmfield Avenue at around 10.20pm.

“He was assaulted and suffered a stab wound to his abdomen. His injuries are serious but not life threatening.

“We are appealing for information about anyone acting suspiciously. This appears to be an unprovoked attack.”

The first suspect is described as white, early 20s, 5ft 9in, skinny, with a scrawny build and who was wearing a dark tracksuit. He spoke with a deep voice.

The other suspect is described as mixed race, early 20s, 5ft 7in and of medium build.

Both men were wearing black bandanas with white lines across them.

Anyone with information should contact police on 101.

In unrelated investigations, police would like to speak to the people pictured in the image gallery below. The people pictured in the images may be witnesses as well as suspects. If you recognise anyone, contact police on 101 quoting the reference number on the image caption.